CN101710617B - High-energy silicon-carbon composite negative electrode material for lithium ion battery and manufacturing process thereof - Google Patents
High-energy silicon-carbon composite negative electrode material for lithium ion battery and manufacturing process thereof Download PDFInfo
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- CN101710617B CN101710617B CN2009100279381A CN200910027938A CN101710617B CN 101710617 B CN101710617 B CN 101710617B CN 2009100279381 A CN2009100279381 A CN 2009100279381A CN 200910027938 A CN200910027938 A CN 200910027938A CN 101710617 B CN101710617 B CN 101710617B
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Abstract
The invention relates to a high-energy silicon-carbon composite negative electrode material for a lithium ion battery and a manufacturing process thereof. The negative electrode material takes silicon powder or a mixture of the silicon powder and graphite powder as a core material, takes pyrolytic carbon as a shell material, and uses the shell material to coat the core material. The process for manufacturing the negative electrode material provided by the invention is characterized by performing nanoscale processing on mesophase pitch, ensuring that the nanoscale mesophase pitch is in a semi-liquid state, spraying the semi-liquid nanoscale mesophase pitch to the surface of a substrate of the silicon powder or the surface of a substrate of the mixture of the silicon powder and the graphitepowder through a nanometer spraying device to realize the uniform coating, and finally obtaining a negative electrode material for a secondary battery through conventional drying, carbonization and graphitization processes (a high-strength magnetic field is applied during the carbonization and the graphitization). The specific capacity of high-energy silicon-carbon battery powder manufactured by the process can reach more than 1,050mAh/g, and over 80 percent of capacity can still be maintained after the circulation for 500 times.
Description
Technical field
The present invention relates to the manufacturing process of lithium ion battery with manufacturing process, the especially high-energy silicon-carbon composite negative electrode material for lithium ion battery of negative material.
Background technology
Secondary cell has been that the battery of new generation after Ni-MH battery is representative with the lithium ion battery since the eighties of last century the nineties, because of its have operating voltage height, energy density big, have extended cycle life, advantages such as self discharge is little, memory-less effect, become the chemical power source of present high-grade consumer electronics first-selection, and be penetrated into sophisticated technology fields such as Aero-Space, military affairs.Be accompanied by the demand that it grows with each passing day, secondary cell is just becoming the emphasis and the focus of new century scientific and technical research and exploitation.
At present maximum in the commercial applications is the graphite-like negative material, but its theoretical specific capacity has only 372mAh/g, has limited the further raising of capacity of lithium ion battery.Academia is very active to some novel negative materials such as Al, Sn, Sb, Si and alloy material research thereof at present, because of it has more than the high specific capacity of graphite, and can be as the monocrystalline silicon specific capacity up to 4200mAh/g.But the bulk effect that such negative material is high has caused relatively poor cyclical stability, has influenced its commercialization process.Therefore how making these materials can practicability be the hot issue of current Study on Li-ion batteries using.
At present, the researcher has adopted the composite material of various silicon, as materials such as Si-Ni alloy, Ti-Si alloys, carries out the produced with combination silicon carbon material separately or with graphite, has obtained certain improvement but still not ideal enough on cycle performance.Except that adopting silicon composite, also have the researcher to adopt silicon nanowires (diameter 15nm, length hundreds of nanometer) to make negative material, though significantly improved its capacity and cycle performance, cost of manufacture is high, extensive commercial difficulty.
Summary of the invention
The manufacturing process that the purpose of this invention is to provide high-energy silicon-carbon composite negative electrode material for lithium ion battery.
For achieving the above object, the present invention has provided the high-energy silicon-carbon composite negative electrode material for lithium ion battery technical scheme, this high-energy silicon-carbon composite negative electrode material for lithium ion battery is made of core material and case material, coat core material with case material, described core material is silica flour or silica flour and graphite powder mixture, and described case material is a RESEARCH OF PYROCARBON.
In technique scheme, the percentage by weight of described core material silica flour is 10%～60%, and the RESEARCH OF PYROCARBON percentage by weight of described case material is 40%～90%.Described silica flour is monocrystalline silica flour or polycrystalline silica flour, and purity is 99%～99.999999%, and its particle is micron order and submicron order, and granularity is between 0.1-25 μ m.Described RESEARCH OF PYROCARBON is to be that persursor material makes with the nanoscale mesophase pitch.Forming the persursor material nanoscale mesophase pitch of RESEARCH OF PYROCARBON shell structure, is mesophase pitch to be immersed nano-milled machine carry out obtaining in wet lapping 2-3 hour, and the granularity of grinding the back mesophase pitch is 30nm to 50nm.
In technique scheme, the percentage by weight of described core material silica flour is 5%～50%, and the percentage by weight of described core material graphite powder is 35%～90%, and the RESEARCH OF PYROCARBON percentage by weight of described case material is 5%～15%.Described silica flour is monocrystalline silica flour or polycrystalline silica flour, and purity is 99%～99.999999%, and its particle is micron order and submicron order, and granularity is between 0.1-25 μ m.Described graphite powder is a high-purity graphite powder, and its purity is 99.9%-99.99999999%, and granularity is between 5-40 μ m.Described RESEARCH OF PYROCARBON is to be that persursor material makes with the nanoscale mesophase pitch.Forming the persursor material nanoscale mesophase pitch of RESEARCH OF PYROCARBON shell structure, is mesophase pitch to be immersed nano-milled machine carry out obtaining in wet lapping 2-3 hour, and the granularity of grinding the back mesophase pitch is 30nm to 50nm.
For achieving the above object, the present invention gives the manufacturing process of lithium ion battery with the high-energy silicon-carbon negative material.
The present invention provides directly coats RESEARCH OF PYROCARBON with silica flour to form the manufacturing technology steps condition of lithium ion battery negative material as follows:
(1) 10%～60% silica flour is put in the pyroreaction still that adds inert gas shielding, pyroreaction still heating rate is to heat up that 100 ℃, warm-up time are 3-5 hour, to make the temperature in the pyroreaction still be 300 ℃-500 ℃ in per 1 hour, pyroreaction still mixing speed is 60-300 rev/min, bone dry and burn some pollutants in the pyroreaction still;
(2) make the pyroreaction still be cooled to 200 ℃-300 ℃, this pyroreaction temperature in the kettle near but be no more than the softening point of nanoscale mesophase pitch;
(3) the 40%-90% nanoscale mesophase pitch that will be used for coating layer is input to heat pipe and heats 3-10 second, making the nanoscale mesophase pitch temperature through superheater tube is 200 ℃-350 ℃, this temperature is a little more than the softening point of nanoscale mesophase pitch, thereby obtains nanoscale semiliquid mesophase pitch;
(4) will deliver to nano-nozzle through the superheater tube semiliquid nanoscale mesophase pitch that obtains of heating, the nanoscale mesophase pitch droplet that sprays at a high speed through nano-nozzle enters into described pyroreaction still, the mixing speed of pyroreaction still is 60-300 rev/min, in the pyroreaction still, nanoscale mesophase pitch droplet mixed the coating silica flour 2-3 hour, this process pyroreaction temperature in the kettle is 200 ℃-300 ℃, this temperature near but be no more than the softening point of nanoscale mesophase pitch, the pressure in the pyroreaction still is 10
-5-10
-3Pa;
(5) will coat silica flour and send into vacuum drying oven from the pyroreaction still by the road, be filled with inert gas (helium or neon or argon gas, He-Ne gaseous mixture, helium is argon-mixed, neon is argon-mixed, He-Ne is argon-mixed) in the vacuum drying oven, temperature is at 400 ℃-500 ℃ in the vacuum drying oven, and the vacuumize furnace pressure is 10
-5-10
-3Pa, be 2-3 hour drying time;
(6) the coating silica flour after the dry reprocessing is sent into the high temperature cabonization vacuum furnace by the road again, is filled with inert gas in the high temperature cabonization vacuum furnace, and the pressure in the high temperature cabonization vacuum furnace is 10
-4-10
-1Pa, the temperature rise rate of high temperature cabonization vacuum furnace is for per hour heating up 100 ℃, and making the temperature of high temperature cabonization vacuum furnace is 700-1600 ℃, is added with high high-intensity magnetic field in the high temperature carbonization furnace, the strength range of high high-intensity magnetic field is 100-20000GS, and the carbonisation time is 12-20 hour;
(7) the coating silica flour after the carbonization treatment is sent into the high temperature graphitization vacuum furnace by the road again, is filled with inert gas in the high temperature graphitization vacuum furnace, and the pressure in the high temperature graphitization vacuum furnace is 10
-4-10
-1Pa, the temperature rise rate of high temperature graphitization vacuum furnace is for per hour heating up 100 ℃, and the temperature that makes the high temperature graphitization vacuum furnace is 1600-3000 ℃, is added with high high-intensity magnetic field in the high temperature graphitization stove, the graphitizing process time is 12-20 hour, obtains uniform carbon and coats silicon powder.
Silica flour that the present invention provides and high purity graphite powder mixture coat RESEARCH OF PYROCARBON, and the manufacturing technology steps condition that forms lithium ion battery negative material is as follows:
(1) silica flour and the 35%-90% graphite powder with 5%-50% drops in the mixer (cone-type mixer or twin shaft paddle mixer), carries out middling speed and mixes, and incorporation time is 10 minutes-4 hours;
(2) mixture of 5%-50% silica flour and 35%-90% graphite powder is put in the pyroreaction still that adds inert gas shielding, pyroreaction still heating rate is to heat up that 100 ℃, warm-up time are 3-5 hour, to make the temperature in the pyroreaction still be 300 ℃-500 ℃ in per 1 hour, pyroreaction still mixing speed is 60-300 rev/min, bone dry and burn some pollutants in the pyroreaction still;
(3) make the pyroreaction still be cooled to 200 ℃-300 ℃, this pyroreaction temperature in the kettle near but be no more than the softening point of nanoscale mesophase pitch;
(4) the 5%-15% nanoscale mesophase pitch that will be used for coating layer is input to heat pipe and heats 3-10 second, making the nanoscale mesophase pitch temperature through superheater tube is 200 ℃-350 ℃, this temperature is a little more than the softening point of nanoscale mesophase pitch, thereby obtains nanoscale semiliquid mesophase pitch;
(5) will deliver to nano-nozzle through the superheater tube semiliquid nanoscale mesophase pitch that obtains of heating, the nanoscale mesophase pitch droplet that sprays at a high speed through nano-nozzle enters into described pyroreaction still, the mixing speed of pyroreaction still is 60-300 rev/min, in the pyroreaction still, nanoscale mesophase pitch droplet mixed the coating silica flour 2-3 hour, this process pyroreaction temperature in the kettle is 200 ℃-300 ℃, this temperature near but be no more than the softening point of nanoscale mesophase pitch, the pressure in the pyroreaction still is 10
-5-10
-3Pa;
(6) will coat silica flour and send into vacuum drying oven from the pyroreaction still by the road, be filled with inert gas (helium or neon or argon gas, He-Ne gaseous mixture, helium is argon-mixed, neon is argon-mixed, He-Ne is argon-mixed) in the vacuum drying oven, temperature is at 400 ℃-500 ℃ in the vacuum drying oven, and the vacuumize furnace pressure is 10
-5-10
-3Pa, be 2-3 hour drying time;
(7) the coating silica flour after the dry reprocessing is sent into the high temperature cabonization vacuum furnace by the road again, is filled with inert gas in the high temperature cabonization vacuum furnace, and the pressure in the high temperature cabonization vacuum furnace is 10
-4-10
-1Pa, the temperature rise rate of high temperature cabonization vacuum furnace is for per hour heating up 100 ℃, and making the temperature of high temperature cabonization vacuum furnace is 700-1600 ℃, is added with high high-intensity magnetic field in the high temperature carbonization furnace, the strength range of high high-intensity magnetic field is 100-20000GS, and the carbonisation time is 12-20 hour;
(8) the coating silica flour after the carbonization treatment is sent into the high temperature graphitization vacuum furnace by the road again, is filled with inert gas in the high temperature graphitization vacuum furnace, and the pressure in the high temperature graphitization vacuum furnace is 10
-4-10
-1Pa, the temperature rise rate of high temperature graphitization vacuum furnace is for per hour heating up 100 ℃, and the temperature that makes the high temperature graphitization vacuum furnace is 1600-3000 ℃, is added with high high-intensity magnetic field in the high temperature graphitization stove, the graphitizing process time is 12-20 hour, obtains uniform carbon and coats silicon powder.
In above-mentioned two kinds of lithium cell cathode material manufacturing process, silicon powder and graphite microparticles adopt cone-type mixer or twin shaft paddle mixer to mix.
In above-mentioned two kinds of lithium cell cathode material manufacturing process, described inert gas is helium or neon or argon gas, He-Ne gaseous mixture, helium is argon-mixed, neon is argon-mixed, He-Ne is argon-mixed.
In above-mentioned two kinds of lithium cell cathode material manufacturing process, be added with high high-intensity magnetic field in the described high temperature carbonization furnace, the strength range of high high-intensity magnetic field is 100-20000GS.
The invention has the beneficial effects as follows, adopt nanoscale mesophase pitch case material to coat core material silica flour or silica flour and graphite powder mixture, formation has the silicon-carbon composite lithium ion battery negative material of nucleocapsid structure, can give full play to the height ratio capacity characteristic of silicon, theoretical capacity than native graphite improves more than 30%, can go up largely and improve the coating uniformity and spherical integrity degree, effectively promote cycle performance.Adopt high high-intensity magnetic field, effectively improved the degree of orientation between silica flour and the graphite powder, improved charge-discharge velocity; Above measure improves the material cyclical stability, has kept low to charging/discharging of secondary cell voltage, and charge and discharge platform is long, the advantage that cycle life is good.
Description of drawings:
Fig. 1 is that the present invention directly coats RESEARCH OF PYROCARBON formation lithium ion battery negative material manufacturing technology steps schematic diagram with silica flour.
Fig. 2 is that the present invention coats RESEARCH OF PYROCARBON formation lithium ion battery negative material manufacturing technology steps schematic diagram with silica flour and high purity graphite powder mixture.
In the above accompanying drawing, the 1st, mesophase pitch raw material, the 2nd, silica flour or mixture (manufacturing process of mixture is seen little figure), the 3rd, nano-milled machine, the 4th, heat pipe, the 5th, nano-nozzle, the 6th, the pyroreaction still, the 7th, vacuum drying oven, the 8th, high temperature cabonization vacuum furnace, the 9th, high temperature graphitization vacuum furnace, the 10th, coated silica flour, the 11st, graphite powder, the 12nd, mixer, the 13rd, silica flour graphite powder mixture.
Embodiment
Embodiment one:
The equipment of this example is formed as shown in Figure 1.Complete equipment all is in whole sealing status by pipeline connection.Wherein nano-milled machine is selected the nano-milled machine of DRAIS PML-H/V universal type for use.
At first 20 kilograms of monocrystalline silica flours are put in the pyroreaction still 6, charge into helium, neon, argon mixture gas in the pyroreaction still, the mixing speed of pyroreaction still is 220 rev/mins, per hour to rise 100 ℃ heating rate, heated 4 hours, the temperature in the pyroreaction still is risen to 400 ℃.The monocrystalline silica flour is finished drying in the pyroreaction still, the minute quantity pollutant is also burned clean.Heated in 4 hours finish after, make the pyroreaction still be cooled to 240 ℃, this temperature near but be no more than the softening point of nanoscale mesophase pitch so that the monocrystalline silica flour can mix coating preferably with the nanoscale mesophase pitch droplet that sprays into.
With the above-mentioned steps while, 80 kilograms of mesophase pitch 1 are immersed in the nano-milled machine 2, adopt the wet lapping method, ground 2.5 hours, and, be the nanoscale mesophase pitch of 30nm to 50nm with phase granularity in the middle of guaranteeing with the granularity that the back mesophase pitch is ground in the detection of Mastersizer 2000-grain size analysis instrument.Be input in the heat pipe 4 and heated for 7 seconds with being about to the nanoscale mesophase pitch, making the nanoscale mesophase pitch temperature through superheater tube 4 is 240 ℃, this temperature near but be no more than the softening point of nanoscale mesophase pitch, thereby obtain nanoscale semiliquid mesophase pitch.Nanoscale semiliquid mesophase pitch is directly sprayed in the pyroreaction still by nano-nozzle, with monocrystalline silica flour mixing coating wherein, the mixing speed of pyroreaction still is 220 rev/mins, spraying mix the coating process through the time 2.5 hours, the pressure in the pyroreaction still is 10
-4Pa, temperature maintains 240 ℃ all the time.
To coat silica flour and send into vacuum drying oven 7 from pyroreaction still 6 by the road and carry out dried, and be filled with helium, neon, argon mixed inert gas in the vacuum drying oven, temperature is at 450 ℃ in the vacuum drying oven, and the vacuumize furnace pressure is 10
-4Pa, be 2.5 hours drying time.
Coating silica flour after the dry reprocessing is sent into high temperature cabonization vacuum furnace 8 by the road again carry out carbonization treatment, be filled with helium, neon, argon mixed inert gas in the high temperature cabonization vacuum furnace, the pressure in the high temperature cabonization vacuum furnace is 10
-3Pa, the temperature rise rate of high temperature cabonization vacuum furnace is for per hour heating up 100 ℃, and making the temperature of high temperature cabonization vacuum furnace is 1200 ℃, increases high-intensity magnetic field in the high temperature carbonization furnace, and magnetic field intensity is 1000GS, and the carbonisation time is 17 hours.
Coating silica flour after the carbonization treatment sent into by the road again carry out graphitization processing in the high temperature graphitization vacuum furnace 9, be filled with helium, neon, argon mixed inert gas in the high temperature graphitization vacuum furnace, the pressure in the high temperature graphitization vacuum furnace is 10
-3Pa, the temperature rise rate of high temperature graphitization vacuum furnace are for per hour heating up 100 ℃, and making the temperature in the high temperature graphitization vacuum furnace is 2300 ℃, increases high-intensity magnetic field in the stove, and magnetic field intensity is 1000GS, and the graphitizing process time is 17 hours, is coated silica flour 10 uniformly.
The coated graphite microparticles that present embodiment obtains is used for secondary battery cathode material, and its initial charge capacity (mAh/g) is 1165.41, and discharge capacity (mAh/g) is that 1108.57,500 circulation volumes remain 80.1% first.
Embodiment two:
Silica powder drying in the present embodiment, nanoscale mesophase pitch form and semiliquidization, nanoscale mesophase pitch and silica flour to mix all processes of coating identical with embodiment one, but to coating silica flour when carrying out carbonization, carburizing temperature is 1300 ℃, 3000 ℃ of graphitization temperatures, resulting coating silica flour is used for secondary battery cathode material, its initial charge capacity (mAh/g) is 1180.77, and discharge capacity (mAh/g) is that 1126.38,500 circulation volumes remain 81.7% first.
Embodiment three:
The equipment of this example is formed as shown in Figure 2.
At first 80 kilograms of purity 99.999% spherical graphites and 10 kilograms of purity 99.9% silica flours are put in the mixer, fully mixed 3 hours, mixture is dropped in the pyroreaction still 6 then, charge into helium, neon, argon mixture gas in the pyroreaction still, the mixing speed of pyroreaction still is 200 rev/mins, per hour to rise 100 ℃ heating rate, heated 4 hours, the temperature in the pyroreaction still is risen to 400 ℃.Mixture is finished drying in the pyroreaction still, the minute quantity pollutant is also burned clean.Heated in 4 hours finish after, make the pyroreaction still be cooled to 240 ℃, this temperature near but be no more than the softening point of nanoscale mesophase pitch so that the mixture base material can mix coating preferably with the nanoscale mesophase pitch droplet that sprays into.
With the above-mentioned steps while, 15 kilograms of mesophase pitch 1 are immersed in the nano-milled machine 2, adopt the wet lapping method, ground 2.5 hours, and, be the nanoscale mesophase pitch of 30nm to 50nm with phase granularity in the middle of guaranteeing with the granularity that the back mesophase pitch is ground in the detection of Mastersizer 2000-grain size analysis instrument.Be input in the heat pipe 4 and heated for 7 seconds with being about to the nanoscale mesophase pitch, making the nanoscale mesophase pitch temperature through superheater tube 4 is 240 ℃, this temperature near but be no more than the softening point of nanoscale mesophase pitch, thereby obtain nanoscale semiliquid mesophase pitch.Nanoscale semiliquid mesophase pitch is directly sprayed in the pyroreaction still by nano-nozzle, with graphite silicon mixture base material mixing coating wherein, the mixing speed of pyroreaction still is 200 rev/mins, spraying mix the coating process through the time 2.5 hours, the pressure in the pyroreaction still is 10
-4Pa, temperature maintains 240 ℃ all the time.
Will be coating send into vacuum drying oven 7 from pyroreaction still 6 by the road and carry out dried, be filled with helium, neon, argon mixed inert gas in the vacuum drying oven, temperature is at 450 ℃ in the vacuum drying oven, the vacuumize furnace pressure is 10
-4Pa, be 2.5 hours drying time.
Coated graphite after the dry reprocessing is sent into high temperature cabonization vacuum furnace 8 by the road again carry out carbonization treatment, be filled with helium, neon, argon mixed inert gas in the high temperature cabonization vacuum furnace, the pressure in the high temperature cabonization vacuum furnace is 10
-3Pa, the temperature rise rate of high temperature cabonization vacuum furnace is for per hour heating up 100 ℃, and the temperature that makes the high temperature cabonization vacuum furnace is 1200 ℃, and 8000GS magnetic field in addition, and the carbonisation time is 17 hours.
Coated graphite after the carbonization treatment sent into by the road again carry out graphitization processing in the high temperature graphitization vacuum furnace 9, be filled with helium, neon, argon mixed inert gas in the high temperature graphitization vacuum furnace, the pressure in the high temperature graphitization vacuum furnace is 10
-3Pa, the temperature rise rate of high temperature graphitization vacuum furnace be for per hour heating up 100 ℃, and making the temperature in the high temperature graphitization vacuum furnace is 2500 ℃, and 8000GS magnetic field in addition, and the graphitizing process time is 17 hours, obtains uniform high-energy silicon-carbon battery powder 10.
The coated graphite microparticles that present embodiment obtains is used for secondary battery cathode material, and its initial charge capacity (mAh/g) is 1090.50, and discharge capacity (mAh/g) is that 1050.80,500 circulation volumes remain 81.6% first.
Embodiment four:
Graphite microparticles in the present embodiment and silica flour mix, dry, the nanoscale mesophase pitch forms and semiliquidization, it is identical with embodiment three that nanoscale mesophase pitch and graphite and silica flour mixture base material hybrid packet are covered all processes, but when coating is heated, carburizing temperature is 1300 ℃, 3000 ℃ of graphitization temperatures, it is 10000GS that institute adds magnetic field intensity, resulting high-energy silicon-carbon battery powder is used for secondary battery cathode material, its initial charge capacity (mAh/g) is 1010.58, discharge capacity (mAh/g) is that 1075.47,500 circulation volumes remain 84.2% first.
Claims (4)
1. the manufacturing process of a high-energy silicon-carbon composite negative electrode material for lithium ion battery is characterized in that:
(1) 10%～60% silica flour is put in the pyroreaction still that adds inert gas shielding, pyroreaction still heating rate is to heat up that 100 ℃, warm-up time are 3～5 hours, to make the temperature in the pyroreaction still be 300 ℃-500 ℃ in per 1 hour, pyroreaction still mixing speed is 60～300 rev/mins, bone dry and burn some pollutants in the pyroreaction still;
(2) make the pyroreaction still be cooled to 200 ℃-300 ℃, this pyroreaction temperature in the kettle near but be no more than the softening point of nanoscale mesophase pitch;
(3) 40%～90% nanoscale mesophase pitch that will be used for coating layer is input to heat pipe and heated for 3～10 seconds, making the nanoscale mesophase pitch temperature through superheater tube is 200 ℃-350 ℃, this temperature is a little more than the softening point of nanoscale mesophase pitch, thereby obtains nanoscale semiliquid mesophase pitch;
(4) will deliver to nano-nozzle through the superheater tube semiliquid nanoscale mesophase pitch that obtains of heating, the nanoscale mesophase pitch droplet that sprays at a high speed through nano-nozzle enters into described pyroreaction still, the mixing speed of pyroreaction still is 60～300 rev/mins, in the pyroreaction still, nanoscale mesophase pitch droplet mixed the coating silica flour 2～3 hours, this process pyroreaction temperature in the kettle is 200 ℃-300 ℃, this temperature near but be no more than the softening point of nanoscale mesophase pitch, the pressure in the pyroreaction still is 10
-5-10
-3Pa;
(5) will coat silica flour and send into vacuum drying oven from the pyroreaction still by the road, and be filled with inert gas in the vacuum drying oven, temperature is at 400 ℃-500 ℃ in the vacuum drying oven, and the vacuumize furnace pressure is 10
-5-10
-3Pa, be 2-3 hour drying time;
(6) the coating silica flour after the dry reprocessing is sent into the high temperature cabonization vacuum furnace by the road again, is filled with inert gas in the high temperature cabonization vacuum furnace, and the pressure in the high temperature cabonization vacuum furnace is 10
-4-10
-1Pa, the temperature rise rate of high temperature cabonization vacuum furnace is for per hour heating up 100 ℃, and making the temperature of high temperature cabonization vacuum furnace is 700-1600 ℃, is added with high high-intensity magnetic field in the high temperature carbonization furnace, the strength range of high high-intensity magnetic field is 100-20000GS, and the carbonisation time is 12-20 hour;
(7) the coating silica flour after the carbonization treatment is sent into the high temperature graphitization vacuum furnace by the road again, is filled with inert gas in the high temperature graphitization vacuum furnace, and the pressure in the high temperature graphitization vacuum furnace is 10
-4-10
-1Pa, the temperature rise rate of high temperature graphitization vacuum furnace is for per hour heating up 100 ℃, and the temperature that makes the high temperature graphitization vacuum furnace is 1600-3000 ℃, is added with high high-intensity magnetic field in the high temperature graphitization stove, the graphitizing process time is 12-20 hour, obtains uniform carbon and coats silicon powder.
2. the manufacturing process of a high-energy silicon-carbon composite negative electrode material for lithium ion battery is characterized in that:
(1) silica flour and the 35%-90% graphite powder with 5%-50% drops in the mixer, carries out middling speed and mixes, and incorporation time is 10 minutes-4 hours;
(2) mixture of 5%-50% silica flour and 35%-90% graphite powder is put in the pyroreaction still that adds inert gas shielding, pyroreaction still heating rate is to heat up that 100 ℃, warm-up time are 3-5 hour, to make the temperature in the pyroreaction still be 300 ℃-500 ℃ in per 1 hour, pyroreaction still mixing speed is 60-300 rev/min, bone dry and burn some pollutants in the pyroreaction still;
(3) make the pyroreaction still be cooled to 200 ℃-300 ℃, this pyroreaction temperature in the kettle near but be no more than the softening point of nanoscale mesophase pitch;
(4) the 5%-15% nanoscale mesophase pitch that will be used for coating layer is input to heat pipe and heats 3-10 second, making the nanoscale mesophase pitch temperature through superheater tube is 200 ℃-350 ℃, this temperature is a little more than the softening point of nanoscale mesophase pitch, thereby obtains nanoscale semiliquid mesophase pitch;
(5) will deliver to nano-nozzle through the superheater tube semiliquid nanoscale mesophase pitch that obtains of heating, the nanoscale mesophase pitch droplet that sprays at a high speed through nano-nozzle enters into described pyroreaction still, the mixing speed of pyroreaction still is 60-300 rev/min, in the pyroreaction still, nanoscale mesophase pitch droplet mixed the coating silica flour 2-3 hour, this process pyroreaction temperature in the kettle is 200 ℃-300 ℃, this temperature near but be no more than the softening point of nanoscale mesophase pitch, the pressure in the pyroreaction still is 10
-5-10
-3Pa;
(6) will coat silica flour and send into vacuum drying oven from the pyroreaction still by the road, and be filled with inert gas in the vacuum drying oven, temperature is at 400 ℃-500 ℃ in the vacuum drying oven, and the vacuumize furnace pressure is 10
-5-10
-3Pa, be 2-3 hour drying time;
(7) the coating silica flour after the dry reprocessing is sent into the high temperature cabonization vacuum furnace by the road again, is filled with inert gas in the high temperature cabonization vacuum furnace, and the pressure in the high temperature cabonization vacuum furnace is 10
-4-10
-1Pa, the temperature rise rate of high temperature cabonization vacuum furnace is for per hour heating up 100 ℃, and making the temperature of high temperature cabonization vacuum furnace is 700-1600 ℃, is added with high high-intensity magnetic field in the high temperature carbonization furnace, the strength range of high high-intensity magnetic field is 100-20000GS, and the carbonisation time is 12-20 hour;
(8) the coating silica flour after the carbonization treatment is sent into the high temperature graphitization vacuum furnace by the road again, is filled with inert gas in the high temperature graphitization vacuum furnace, and the pressure in the high temperature graphitization vacuum furnace is 10
-4-10
-1Pa, the temperature rise rate of high temperature graphitization vacuum furnace is for per hour heating up 100 ℃, and the temperature that makes the high temperature graphitization vacuum furnace is 1600-3000 ℃, is added with high high-intensity magnetic field in the high temperature graphitization stove, the graphitizing process time is 12-20 hour, obtains uniform carbon and coats silicon powder.
3. the manufacturing process of high-energy silicon-carbon composite negative electrode material for lithium ion battery according to claim 1 and 2, it is characterized in that: described inert gas is helium or neon or argon gas, He-Ne gaseous mixture, helium is argon-mixed, neon is argon-mixed, He-Ne is argon-mixed.
4. the manufacturing process of high-energy silicon-carbon composite negative electrode material for lithium ion battery according to claim 2, it is characterized in that: described mixer is cone-type mixer or twin shaft paddle mixer.
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